Detectives believe that a teenager who's charged with stabbing 21 of his fellow students and a security guard at Franklin Regional High School threatened two students by phone before the attack, according to a search warrant.

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The warrant, obtained for the home of 16-year-old Alex Hribal in Murrysville, said two students received "threatening phone messages and completed calls" from someone believed to be Hribal.

Neither student was one of the stabbing victims, and the warrant does not say when the calls were made.

According to a Franklin Regional parent, her son was one received a threatening phone call the night before the attacks on Wednesday morning.

The student tweeted about the phone call at 8:06 a.m. Wednesday, less than an hour after the stabbings happened.

"Got a restricted phone call last night from a kid that said he was going to (expletive) me up today, didn't think anything of it," was posted in the tweet. It included a snapshot of the time stamped "no caller ID" incoming phone call, listed at 9:17 p.m.

The same language is used in the search warrant affidavit that mentions the threatening phone calls. It says that the caller told two students he would "(expletive) them up."

The affidavit says, "The caller is believed to be the actor [Hribal] because of the subsequent conduct of the actor coming to school and attacking numerous individuals."

Pittsburgh's Action News 4 asked Hribal's attorney, Pat Thomassey, about the phone calls on Thursday. He replied, "That is a rumor that I do not think is true. He was home all night the night before this occurred, with his parents. They did not see him on the phone arguing with anybody."

Murrysville Police Chief Thomas Seefeld said that the investigation was continuing and that there was no known motive yet.

"There's talk out there of certain things happening, with the threat and things like that. That's part of our investigation and surely we'll look into that, but right now it's early and we'll put that together," Seefeld said on Thursday.

A neighbor of a student who allegedly received one of the calls said the family told him that the FBI took the student's cellphone as part of the investigation.

The student's tweet has since been deleted.

Hribal is charged as an adult with attempted homicide and aggravated assault. He is being held without bail while he awaits a preliminary hearing.